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TextStream: move back to top of file?

Posted on 2002-05-29
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Last Modified: 2008-02-01
Is there a method I can use to move to the top of a text file when reading? Or do I need to use a different object?

Thanks!
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Question by:SuperMario
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raizon earned 50 total points
ID: 7042332
Only way I know of using the TextStream Object would be to close the file and destroy the object then re open it.  This will put you back at the beginning of the file.  However it doesn't seem to efficient to me.

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by:SuperMario
ID: 7042335
Me either... I have restructured my code a little bit.. but thanks anyway :)
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by:raizon
ID: 7042354
Did you use the textstreamobject or go a different route?
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Expert Comment

by:Richie_Simonetti
ID: 7042584
what do you mean by "top of a text file when reading"?
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Author Comment

by:SuperMario
ID: 7042801
I went a different route, actually... I was reading in line by line initially and needed to return to the initial state for another function. I ended up writing it in the same piece of code.
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Expert Comment

by:Crin
ID: 7042824
You can use following:

FileNum = FreeFile(0)
Open "File.txt" For Random As FileNum Len = 1

And then take text from any position using:

Get FileNum, CurFilePos + i, curchar

However, this require to rewrite LineInput function which is very simple, say if you need help here.

Sincerely,
Crin


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Expert Comment

by:Richie_Simonetti
ID: 7042827
Then, problem was solved by yourself using different approach?
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Expert Comment

by:Crin
ID: 7042839
Sorry, posted comment without enough explanations.

Get FileNum, CurFilePos, curchar

This line will read ONE symbol into curchar variable taken from CurFilePos position.

public Function CustomLineInput(CurFilePos as long) as string
Dim Result as string, curchar as String * 1, i as long

Result = ""
curchar = ""
i = 0

Do
  Get FileNum, CurFilePos + i, curchar
  if curchar <> chr(13) and curchar <> chr(10) then
    Result = Result & curchar
  end if
Loop Until curchar = chr(13) and CurFilePos + i < LOF(FileNum)

CustomLineInput = Result

End Function

Now you just need to maintain CurFilePos right way.

Sincerely,
Crin
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Expert Comment

by:Crin
ID: 7042844
It is night here, so some typos coming...

Loop Until curchar = chr(13) and CurFilePos + i < LOF(FileNum)

should be:

Loop Until curchar = chr(13) or CurFilePos + i = LOF(FileNum)

Sincerely,
Crin

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Expert Comment

by:raizon
ID: 7042925
yes I believe that SuperMario did solve this on thier own by using a different approach.
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